package org.bouncycastle.asn1;

import java.io.IOException;

public abstract class ASN1Object extends DERObject {
    /**
     * Create a base ASN.1 object from a byte stream.
     * 
     * @param data
     *            the byte stream to parse.
     * @return the base ASN.1 object represented by the byte stream.
     * @exception IOException
     *                if there is a problem parsing the data.
     */
    public static ASN1Object fromByteArray(byte[] data) throws IOException {
        ASN1InputStream aIn = new ASN1InputStream(data);

        try {
            return (ASN1Object) aIn.readObject();
        } catch (ClassCastException e) {
            throw new IOException("cannot recognise object in stream");
        }
    }

    public final boolean equals(Object o) {
        if (this == o) {
            return true;
        }

        return (o instanceof DEREncodable)
                && asn1Equals(((DEREncodable) o).getDERObject());
    }

    public abstract int hashCode();

    abstract void encode(DEROutputStream out) throws IOException;

    abstract boolean asn1Equals(DERObject o);
}
